> �...@photo = Photo.find_by_project_id(params[:photo => :project_id])
> (also have tried (params[:photo]
> [:project_id]
I'd be surprised if this didn't give an exception as the params is
using hash notation for the key. If project_is is unique on your
photo, then you want something like params[:photo][:project_id]
assuming your params data structure is something like this:
{ :photo => { :project_id => #, ... }, ... }
Do a raise params.inspect at the beginning of your controller method
if you're not sure how it is structured. Looking further down, that
is indeed how your params is handled.
You might want to take a look at some ruby tutorials and practice with
that or if it's just the hashes throwing you off, take a closer look
at them.
>
> in PhotosController statement always evalutates to nil,
>
> if @photo != nil
> @photo.update_attributes(params[:photo])
>
> even though the project_id is in the params hash:
> (output from my application log:)
>
> Parameters: {"photo"=>{"project_id"=>"371", "user_id"=>"14",
> "lwrimg"=>#<File:/tmp/RackMultipart.26504.0>}, "page_path"=>"projects/
> edit", "authenticity_token"=>"iiwoOHgAaBTCv/U4xhmvlR2qleLbG
> +Ov70cubJ7G8jQ=", "after_submit"=>"stay-here"}
>
> ...so the project_id is set.
>
> However, the SQL query is:
>
> [4;35;1mPhoto Load (0.2ms)[0m [0mSELECT * FROM `photos` WHERE
> (`photos`.`project_id` IS NULL) LIMIT 1[0m
>
> ...which seems to indicate that (params[:photo => :project_id]) is
> returning NULL,
> or that I am misunderstanding
>
> @photo = Photo.find_by_project_id(params[:photo => :project_id])
>
> I thought the above would be that @photo is a copy of the record found
> in the d.b., and
> thus I would be able to use the test:
>
> if @photo != nil
>
> So, what is the correct way to update a record if it exists?
>
> Cheers,
> Jet
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